Lock



L. MAYNARD July 2,. 1929.

LOCK

Filed Aug. 6. 1927 6 Sheets-Sheet INVENTO.

BY dasi'erflf diam ATTORNEY.

July 2, 1929.

L. MAYNARD 1.719.335

LOCK

Filed Aug. 6, 1927 3 Sheets-Sheet 2 3 W X INVENfbR.

g leszezmafiyflar-d, BY

Patented July 2, 1929.

UNITED STATES LESTER MAYNARD, OF HAVRE, FRANCE.

LOCK.

Application filed August 6, 1927. Serial No. 211,161.

My invention relates to locks, and more particularly to locks for hand impression seals, stamps or similar devices, although the invention has for its broadest aspect the provision of a lock of the character hereinafter described, which may be applied to any device or mechanism containing a reciprocal or rotating plunger, rod, or shaft, and which lock is adapted to maintain such plunger, rod" or shaft from reciprocal or rotary movement.

Specifically, my invention has for its object the provision of such a lock which is contained within a housing, and which hous ing when once' applied to the device or mechanism. for which it is intended cannot thereafter be separated from the device without breaking or mutilating the lock to such extent that it will be immediately apparent that an unauthorized attempt had been made to use the same.

It is my intention to provide such a lock wherein a spring pressed bolt 0r latch is projected into a hole or recess formed in the impression seal plunger when the same is in alignment therewith, unless said bolt is held retracted from engagement with the hole or recess by means of a keywhich is adapted to remain in the lock as long as the bolt is held in inoperative or retracted position. It is further my intention to utilize the above referred to spring pressed bolt or latch to always maintain the lock housing rigidly secured to the impression seal. This is accomplished by projecting the bolt or latch through the cylindrical casing surrounding the seal plunger and only permitting the retraction of the bolt by a key when the lock is once assembled with respect to the seal, to such extent that it will be withdrawn'from engagement with the hole or recess in the plunger but never retracted sufiiciently so as to be withdrawn from engagement with the cylinder casing surrounding the plunger, thereby always maintaining a locking or latching engagement with the casing.

I still further provide a simple but easily operated lock mechanism contained within the housing which is adapted to be attached to the seal.

To more clearly set forth my invention, reference is made to the accompanying drawings which illustrate the preferred form thereof and in which Figure 1 is a perspective view of the lock attached to a hand seal;

different positions in the act Fig. 2 is a vertical plan view partly in section of the lock applied to a seal and in locking engagement therewith;-

Figs. 3 and 4 are vertical plan views partly in section of the lock housing in its of applying the same to the casingof a seal;

Figs. 5, 6, 7, 8, 9 and 10 are detailed sectional views of the lock mechanism within the lock housing; I

Fig. 11 is a detailed perspective view of the various parts of the lock mechanism arranged in the order in which theya're to be assembled in the housing; and

Figs. 12 and 13 are detailed perspective views of the housing front plate and the plunger or latch member.

As illustrated in the drawings, A represents a plunger of the ordinary hand impression seal shown generally at B, which plunger is surrounded' by the usual cylindrical casing C. The plunger A has a hole or recess D provided therein adapted to receive a spring pressed bolt or latch E when the same is in alignment therewith and released by lock mechanism more fully described hereinafter.

The recess of the with relation to the latter is in engagement therewith the plunger is held from reciprocal movement and locked in its downward or impressing position. Obviously the recessmay be positioned with respect to the plunger so that the same may be locked in its retracted or up position, or there may be two or more recesses provided for locking the plunger in a number of positions, to prevent the same from being reciprocated, turned or rotated.

I will now describe the lock housing and the method of permanently securing the same to the'cylindrical casing O of the seal. F represents a lock housing preferablymade from a single blank of metal and bent into a. cubical form with one open side G. The sides" H and Hi of; this lock housing have beveled edges to closely engage the curved surface of the cylindrical plunger casingC and the top and bottom of the lockhousing designated as I, I respectively are cut inward on an arc to. closely fit against the plunger casing when the lock housing is in its assembled position with respect to the seal. 4

The bottom section of the lock housing has a keyhole slot J formed at its forward plunger is so disposed v bolt E that when the edge adapted to receive a headed stud K permanently secured to the plunger casing. There is also provided a second headed stud L rigidly secured to the plunger casing and adapted to be inserted in the keyhole slot M formed in the face plate N, which face plate is detachably secured in any suitable way to the lock housing at its open end, and through which face plate the spring pressed bolt or latch E is adapted to project.

As above stated, the bolt E is only permitted to be retracted sufficiently far when operated by a key to clear the recess or hole D in the plunger A, but not far enough to become disengaged fromthe plunger casing C during normal manipulation of the bolt to its unlatched or unlocking position. During the assembly or application of the lock housing to the seal casing, the bolt E can be more than normally retracted against spring tension to permit the same to be sprung or shot -hroughthe hole 0 in the plunger casing The application of the lock to the seal is accomplished by aligning the two headed studs K and L with the two keyhole slots J and M respectively, and then drawing the lock housing down until the heads of the studs are seated at the lower heads of the slots. This action would also bring the bolt or latchE in aligment with the hole 0 in the plunger casing, and the same will be projected by a spring which is contained in the lock housing, hereinafter described. Obviously the interior of the plunger casing C will not be accessible and the spring pressed bolt E only being permitted to be retracted by a key sufficiently to clear the hole in the plunger, after the lock is once assembled with respect to the seal, the lock housing will be permanently secured thereto or more specifically to the plunger casing of the seal, and cannot thereafter be removed from the same without breaking or mutil'ating inasmuch as the bolt E is in continual engagement with. the hole O in the plunger casing after the lock housing has been once assembled with respect thereto.

I, will now described the lock mechanism contained within the lock housing F. The latch or bolt E above referred to is adapted to be projected forward by the spring P when the same is released by a key controlled mechanism so as to enter the hole in the seal plunger. This spring P surrounds a reduced end of the bolt E and bears at one end against the back wall of the lock housing and at the other end against an abutment Y carried by the bolt E, which abutment or member Y has channels Z formed in its sides adapted to slide over the headed studs Z carried by the housing when the bolt is reciprocated. llhe cooperation of the studs Z and the channels Z always maintain the bolt in proper alignment with respect to the rest of the lock mechanism. Extending across the lock housing at right angles to the bolt E is a shaft or pin R having an enlarged end B. Slidably mounted upon this shaft R is the rollback S normally held toward the right in Figure 5, by a spring T. The rollback or member S is normally out of engagement with the portion or shoulder U formed integrally with the abutment Y carried by the bolt E. V is a lock cylinder surrounding the enlarged end B of the shaft R while V designates a cup-shaped member surrounding the enlarged portion of the shaft and the cylinder V and held in place by a screw or pin X, the end of which is adapted to have sliding engagement with the bayonet slot W formed in the part B. In operating the lock to release the bolt the key is inserted and engages the rollback or member S, by pushing forward on the key the rollback will be forced forward against the tension of the spring T and when the key is turned the rollback will be turned therewith so that the same will engage the shoulder U of the mem ber Y carried by the bolt E and the bolt will be retracted against the tension of the spring P sufiiciently far to clear the hole in the plunger, but as above stated, not far enough to clear the hole 0 in the plunger casing. As the key is turned and the bolt E retracted, the pin or screw X will be forced to the angle end of the bayonet slot W by a spring P when forward pressure on the key is released and the bolt held in its inoperative or retracted position. To release the lock the key remaining in the slot during the entire time the bolt is retracted, will be slightly pushed forward against the spring pressed rollback and then given a turn to' release the pin X from the angle part of the slot W, whereuponthe rollback is forced to clear the shoulder U upon forward pressure being released upon the key, and the bolt E will be projected into engagement with the hole in the seal plunger to maintain the same in locked or inoperative position.

Having thus described my what I claim is: p p

1. A lock of the class described, in combination with a plunger having a hole there in, a casing. for the plunger with an aperture tlierethrough, a stud rigidly secured to the casing and a lock housing having a slot for receiving the stud and a spring pressed bolt extending from the housing adapted to be projected through the aperture in the casing.

2. A lock of the class described, in combination with a plunger having a hole there in, a casing for the plunger with an aperture theretln'ough, a plurality of studs rigidly secured to the casing and. a lock housing invention,

having a plurality of slots for receiving the studs and a spring pressed bolt extending therefrom adapted to be projected through the aperture in the casing.

3. A lock of the class described, in combination with a plunger having a hole therein, a casing for the plunger with an aperture therethrough, a plurality of studs having enlarged heads rigidly secured to the casing and a lock housing having a plurality of keyhole slots for receiving the studs and a spring pressed bolt extending therefrom adapted to be projected through the aperture and the casing.

t. A lock of the class described, in combination with a plunger having a hole therein, a casing for the plunger with an aperture therethrough, a pair of studs having enlarged heads rigidly secured to the casing and a lock housing having a pair of key hole slots for receiving the studs, one of which Slots is located at a front edge of the lock housing and a spring pressed bolt extending from the housing adapted to be proeeted through the aperture in the casing.

A lock of the class described, in combination with a plunger having a hole therein, a casing for the plunger with an aperture therethrough, a plurality of studs having enlarged heads rigidly secured to the casing and a lock housing formed from a single piece of sheet metal bent to the form of an open ended container with the edges of the open end shaped to the configuration of the plunger easing, a detachable plate for the open end of the housing having a plurality of keyhole slots for receiving the studs and a spring pressed bolt positioned within the lock housing and extending through the plate, which bolt is adapted to be projected through the aperture in the plunger easing when the housing is in assembled relation therewith, and capable of being projected into the hole in the plunger when in locking position.

ti. A lock of the class described, in combinat ion with a plunger having a hole therein, a casing for the plunger with an aperture therethrough, a stud rigidly secured to the casing, a lock housing having a slot for receiving the stud and a spring pressed bolt extending from the housing adapted to be projected through the aperture in the plunger casing and continually maintained in engagement therewith when the lock housing is in assembled relation with the plunger casing, and which bolt is adapted to be projected into the hole in the plunger when in locking position.

7. A lock of the class described, in combination with a plunger having a hole therein, a casing for the plunger having an aperture therethrough, a stud rigidly secured to the casing, a lock housing having a slot for receiving the stud, and a spring pressed bolt extending therefrom adapted to be projected through the aperture in the casing and into engagement with the hole in the plunger when in locking position and adapted to be retracted only sufliciently forward to clear the plunger but remaining in engagement with the aperture in the casing when in unlocking position.

8. A lock of the class described including a housing, a spring pressed plunger therein. a shaft within the housing, a key operated rotatable member mounted upon the shaft and a second spring pressed key operated slidable and rotatable member mounted upon the shaft and adapted to be brought into engagement with the plunger to retract the same.

9. A lock of the class described, including a housing, a spring pressed plunger therein, a shaft within the housing having an enlarged end with a bayonet slot, a screw carried by the housing for engagement with the slot, a key operated rotatable member mounted upon the large end of the shaft, a cupshaped member enclosing the rotatable memher and a second spring pressed key operated slidable or rotatable member mounted upon the reduced portion of the shaft and adapted to be brought into engagement with the plunger to retract the same.

In testimony whereof I afiix my signature.

LESTER MAYNARD. 

